Compilation of field and laboratory geotechnical test data for U.S. Geological Survey drill holes 1C-79, 2C-80, CW 81-2, and CE 82-1, Beluga resource area, upper Cook Inlet region, Alaska

Abstract

Open-File Report 86-382 This report is preliminary and has not been reviewed for conformity with U.S. Geological Survey editorial standards and stratigraphic nomenclature. Any use of trade names is for descriptive purposes only and does not imply endorsement by the USGS.

Surficial geology of the Tyonek area, south-central Tyonek Quadrangle, Alaska

“…Among the clay minerals present, kaolinite and illite are the most abundant, typically comprising 40-60 percent of the clay fraction, and montmorillonite exceeded 10 percent only in three samples from borehole CW 81-2 (Odum and others, 1986, table 5). Moisture contents were consistently less than saturation and less than plastic Atterberg limits, except for a few thin zones of perched water (Odum, 1986;Odum and others, 1986). Neither permafrost nor ground ice was encountered in any of the boreholes.…”

“…The terminal zone of this failure is buried by the large alluvial fan of the Chakachatna and McArthur rivers. Boreholes CW 81-2 and CE 821 were drilled into the lower Tyonek Formation by the USGS ~4.9 km and 9.7 km northeast of this large failure, respectively (Odum, 1986;Odum and others, 1986) (sheet 1). Those borings indicate that the dominant lithologies of the bedrock in this part of the Chuitna coal field are sandstones and siltstones (table 4) and the thickness of glacial drift at the drill sites is 1.8 m and 3.1 m (Odum and others, 1986, fig.…”

Lithological, geotechnical properties analysis, and geophysical log interpretation of U.S. Geological Survey drill holes IC-79, 2C-80, CW 81-2, and CE 82-1, Tyonek Formation, Upper Cook Inlet region, Alaska

“…Patch, Placer U.S., Inc., San Francisco, Calif. (written commun., 1981). Preliminary field-test data and geophysical log interpretation for drill holes USGS CW 81-2 and USGS CE 82-1 were reported by Odum andothers (1983, 1986). Detailed lithologic logs and the results of field and laboratory geotechnical tests for these two drill holes were reported by Odum (1986).…”

“…Preliminary lithologic observations, field-test data, and geophysical log interpretation for these two drill holes were reported by others (1980, 1982). Detailed litl:wlogic logs and the results of field and laboratory geotel:hnical te~ts for these two drill holes were reported by Odum (1986).…”

“…Detailed lithologic logs of each drill hole, along with physical properties and geotechnical data, were presented by Odum (1986). Thin accumulations of organic material and volcanic ashbeds that total less than one meter in thickness are directly beneath the ground surface.…”